Power Management - Panasonic EB-G450 Technical Manual
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Also See for EB-G450:
- Operating instructions manual (32 pages) ,
- Service manual (108 pages) ,
- Operating instructions manual (32 pages)
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POWER SUPPLIES
Current
Battery
mode
Voltage
X
X
X
X
X
active
<4.0V
active
<4.0V
active
<4.0V
active
<4.0V
active
<4.0V
active
X
active
X
active
X
active
X
active
X
9.4
Power Management
The Power supply circuit needs to supply regulated power to the base-band parts, control battery charging and
monitor battery usage.
The power management circuit has three main functions:
1 Voltage regulators
2 Battery charging circuit
3 Power Fail detection
9.4.1 Power Management Circuit
In order to reduce the size and weight of the phone 4 NiMH cells have been chosen as the main power source.
Battery operating Voltage range:
However during charging the voltage could rises as high as 8V and all circuitry connected to the battery must be
designed to operate up to this voltage.
The battery voltage must be stepped-up to power 5V SIM cards. This circuit also shows a Power-On-Reset (POR)
to hold the CPU in a reset state while the supply voltage and system clock stabilise.
Issue 1
Revision 0
http://cxema.ru
HF
nIGNITION
EXTINT
X
X
1
X
X
0
X
X
1
X
X
1
no
X
1
yes
>2.5V
1
yes
<0.5V
1
yes
>2.5V
1
no
X
1
yes
<0.5V
1
yes
>2.5V
1
yes
>2.5V
1
X
X
1
4.0V (minimum safe discharge)
6V
(maximum fully charged )
EXT_PWR
KBR0
_SENSE
X
<0.5V
X
X
1
<0.5V
0
>1.2V
1
>1.2V
1
X
1
>1.2V
0
X
1
>1.2V
1
>1.2V
1
X
0
>1.2V
0
<0.5V
Section 9
9 - 4
Power down
New mode
normal
OFF
emergency
OFF
normal
OFF
normal
restricted
normal
charge
normal
OFF
normal
charge
normal
OFF
normal
charge
normal
charge
normal
OFF
normal
OFF
normal
OFF
MCUK971001G8
Technical Guide
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